The crystal structure of bovine seminal ribonuclease, a homodimeric enzyme closely related to pancreatic ribonuclease, has been refined at a nominal resolution of 1.9 A employing data collected on an electronic area detector. The final model consists of two chains containing 1990 non-H atoms, seven sulfate anions and 113 water molecules per asymmetric unit ...
The crystal structure of bovine seminal ribonuclease, a homodimeric enzyme closely related to pancreatic ribonuclease, has been refined at a nominal resolution of 1.9 A employing data collected on an electronic area detector. The final model consists of two chains containing 1990 non-H atoms, seven sulfate anions and 113 water molecules per asymmetric unit. The unit-cell parameters are a = 36.5 (1), b = 66.7 (1) and c = 107.5 (2) A, space group P22(1)2(1). The R factor is 0.177 for 16 492 reflections in the resolution range 6.0-1.9 A and the deviations from ideal values of bond lengths and bond angles are 0.020 A and 3.7 degrees, respectively. The molecule is formed by two pancreatic like chains, which have their N-terminal segments interchanged so that each active site is formed by residues from both subunits. The two chains are related by a non-crystallographic twofold symmetry and are covalently linked by two consecutive disulfide bridges, which form an unusual sixteen-membered ring across the dimer interface. The deviations from the molecular symmetry, the hydration shell and the sulfate-binding sites are also discussed in relation to the known structure of the pancreatic enzyme.
Related Citations:
Composite Active Sites in Bovine Seminal Ribonuclease Mazzarella, L., Mattia, C.A., Capasso, S., Di Lorenzo, G. (1987) Gazz Chim Ital 117: 91
Refinement of the Structure of Bovine Seminal Ribonuclease Capasso, S., Giordano, F., Mattia, C.A., Mazzarella, L., Zagari, A. (1983) Biopolymers 22: 327
Low-Resolution Structure of Bovine Seminal Ribonuclease: A Covalent Dimeric Protein Capasso, S., Giordano, F., Mattia, C.A., Mazzarella, L., Zagari, A. (1979) Gazz Chim Ital 109: 55
Organizational Affiliation:
Dipartimento di Chimica, Università Federico II, Napoli, Italy.
Download Mendeley
